This would be a good thread to make a list of the options that are out there for Data Acquisition. Off the top of my head there is:
Racepak
http://www.racepak.com/index.php
AiM
http://www.aimsports.com/index.html
MaxQData
http://www.maxqdata.com/index.html
Stack
http://www.stackltd.com/index.html
Traqmate
http://store.traqmate.com/default.asp
And depending on the motor being run a lot of aftermarket ECUs have the ability to datalog.